1880 results about "Carbon coating" patented technology

Reactive halogen-ion plasmas, having for example, generating chloride ions, generated from low-pressure halogen gases using a radio-frequency plasma are employed for producing low-friction carbon coatings, such as a pure carbon film, at or near room temperature on a bulk or thin film of a compound, such as titanium carbide.

A porous silicon based material comprising porous crystalline elemental silicon formed by reducing silicon dioxide with a reducing metal in a heating process followed by acid etching is used to construct negative electrode used in lithium ion batteries. Gradual temperature heating ramp(s) with optional temperature steps can be used to perform the heating process. The porous silicon formed has a high surface area from about 10 m²/g to about 200 m²/g and is substantially free of carbon. The negative electrode formed can have a discharge specific capacity of at least 1800 mAh/g at rate of C/3 discharged from 1.5V to 0.005V against lithium with in some embodiments loading levels ranging from about 1.4 mg/cm² to about 3.5 mg/cm². In some embodiments, the porous silicon can be coated with a carbon coating or blended with carbon nanofibers or other conductive carbon material.

Downhole apparatus and methods of using the apparatus are described, the apparatus comprising at least one metallic component having a DLC coating thereon, the coating present at least on one or more internal passageways of the base metal or alloy to be exposed to downhole environments. Methods of using an apparatus in downhole oilfield operations are also described. This abstract allows a searcher or other reader to quickly ascertain the subject matter of the disclosure. It will not be used to interpret or limit the scope or meaning of the claims.

A method of depositing silicon on carbon nanomaterials such as vapor grown carbon nanofibers, nanomats, or nanofiber powder is provided. The method includes flowing a silicon-containing precursor gas in contact with the carbon nanomaterial such that silicon is deposited on the exterior surface and within the hollow core of the carbon nanomaterials. A protective carbon coating may be deposited on the silicon-coated nanomaterials. The resulting nanocomposite materials may be used as anodes in lithium ion batteries.

The present invention provides an optically clear, hydrophilic coating upon the surface of a silicone medical device by sequentially subjecting the surface of the lens to plasma polymerization in a hydrocarbon-containing atmosphere and then covalently attaching a preformed hydrophilic polymer to the surface of the carbon coating. The invention is especially useful for forming a biocompatible coating on a silicone contact lens.

The invention relates to a lithium ion battery silicon-based composite anode material, a preparation method of the lithium ion battery silicon-based composite anode material, and a battery. The lithium ion battery silicon-based composite anode material adopts an embedded composite core-shell structure, a core has a structure formed by embedding nano silicon particles into a gap of an inner layer of hollowed graphite, and a shell is made from a non-graphite carbon material. According to the silicon-based composite anode material, mechanical grinding, mechanical fusing, isotropic compression processing and carbon coating technologies are combined, so that the nano silicon particles can be successfully embedded into the inner layer of the graphite and the surfaces of graphite particles are uniformly coated; the high-performance silicon-based composite anode material is obtained and is excellent in cycle performance (the 300-times cycle capacity retention ratio is more than 90%) and high in first efficiency (more than 90%); in addition, the silicon-based composite anode material is high in specific energy and compaction density, and can meet the requirements of a high-power density lithium ion battery; the preparation process is simple, the raw material cost is low, and the environment is protected.

Disclosed in the invention are a silicon-carbon composite anode material for lithium ion batteries and a preparation method thereof The material consists of a porous silicon substrate and a carbon coating layer. The preparation method of the material comprises preparing a porous silicon substrate and a carbon coating layer. The silicon-carbon composite anode material for lithium ion batteries has the advantages of high reversible capacity, good cycle performance and good rate performance. The material respectively shows reversible capacities of 1,556 mAh, 1,290 mAh, 877 mAh and 474 mAh/g at 0.2 C, 1 C, 4 C and 15 C rates; the specific capacity remains above 1,500 mAh after 40 cycles at the rate of 0.2 C and the reversible capacity retention rate is up to 90 percent.

Disclosed are a silicon thin film anode for a lithium secondary battery having enhanced cycle characteristics and capacity and a preparation method thereof. A preparation method for a silicon thin film anode for a lithium secondary battery, comprises: preparing a collector including a metal; forming an anode active material layer including a silicon on the collector; forming one or more interface stabilizing layer, by annealing the collector and the anode active material layer under one of an inert atmosphere, a reduced atmosphere, and a vacuum atmosphere to react a metallic component of at least one of the collector and the anode active material layer with a silicon component of the anode active material layer at an interface therebetween; and forming a carbon coating layer on the anode active material layer by performing an annealing process in a hydrocarbon atmosphere.

A negative electrode material for nonaqueous electrolyte secondary batteries comprises composite particles which are prepared by coating surfaces of particles having silicon nano-particles dispersed in silicon oxide with a carbon coating, and etching the coated particles in an acidic atmosphere. The silicon nano-particles have a size of 1-100 nm. The composite particles contain oxygen and silicon in a molar ratio: O<O/Si<1.0. Using the negative electrode material, a lithium ion secondary battery can be fabricated which features a high 1st cycle charge/discharge efficiency, a high capacity, and improved cycle performance.

Negative active materials including metal nanocrystal composites comprising metal nanocrystals having an average particle diameter of about 20 nm or less and a carbon coating layer are provided. The negative active material includes metal nanocrystals coated by a carbon layer, which decreases the absolute value of the change in volume during charge/discharge and decreases the formation of cracks in the negative active material resulting from a difference in the volume change rate during charge/discharge between metal and carbon. Therefore, high charge/discharge capacities and improved capacity retention capabilities can be obtained.

The invention relates to a preparation method of a monodisperse lithium iron phosphate nanometer material, which is characterized by comprising the following steps of: dissolving a soluble lithium source compound, a ferrous source compound, a phosphorus source compound, a dopping element compound, a carbon source compound, and the like into water or a mixed solvent of the water and an organic solvent; sequentially adding to the organic solvent for stirring and mixing according to specific material mole ratio and order, and keeping the volume ratio of the organic solvent to the water to be within a certain range; transferring a mixture to a high-pressure reaction still for heating treatment; and processing a product through a plurality of steps of washing, drying, carbon coating, ball-milling, mixing, annealing, and the like to obtain the lithium iron phosphate anode active material which has high multiplying power circulation and property. The invention also discloses a relevant lithium-ion secondary battery. By adopting a hydrothermal/solvothermal method and using soluble materials as reactants, the invention enables ions to be uniformly mixed in the synthesizing process, thereby obtaining better crystal forms and very pure phases and further enhancing the property of batteries.

A razor blade including a substrate with a cutting edge defined by a sharpened tip and adjacent facets, a layer of hard coating on the cutting edge, an overcoat layer of a chromium containing material on the layer of hard carbon coating, and an outer layer of polytetrafluoroethylene coating over the overcoat layer. Also disclosed is a method of making a razor blade including providing a substrate with a cutting edge defined by a sharpened tip and adjacent facets, and applying an aqueous solution including polytetrafluoroethylene coating over the sharpened tip to result in an outer layer, the polytetrafluoroethylene having a molecular weight of about 45,000.

The invention relates to a metal substrate coated at least partially with a layered structure. The layered structure comprises an intermediate layer deposited on the metal substrate and an amorphous carbon layer deposited on the intermediate layer. The amorphous carbon layer has a Young's modulus lower than 200 GPa. The intermediate layer comprises a tetrahedral carbon layer having a Young's modulus higher than 200 GPa. The invention further relates to a method to reduce the wear on a counterbody of a metal substrate coated with a tetrahedral carbon coating.

The invention relates to a high-capacity SiOx based composite negative electrode material, a preparation method and a battery, wherein the negative electrode material comprises a silicon oxide material, a carbon material and an amorphous carbon coating layer; the silicon oxide material is silicon oxide or silicon oxide material modified in a carbon coating manner; surfaces of carbon material particles are coated with the silicon oxide material. A preparation method of the high-capacity SiOx based composite negative electrode material comprises the steps of performing physical processing or carbon coating modification on a silicon oxide raw material, thus obtaining a micron-sized silicon oxide material; and then mechanically fusing, coating with a solid phase and sintering at a high temperature to obtain the high-capacity negative electrode material. Through the high-capacity SiOx based composite negative electrode material, the effect of uniform dispersing and coating of the micron-sized silicon oxide particles on the surfaces of the carbon material particles can be achieved by virtue of the combination of mechanical fusion and solid-phase coating processes. The silicon oxide particles are well dispersed on the surface of the carbon material particle; the strength of bonding between the silicon oxide particles and the carbon material particles is high; the recycling performance of the material can be greatly improved; and meanwhile, the high-capacity SiOx based composite negative electrode material is high in first efficiency (breaking through the theoretical efficiency of SiOx), low in expansion rate, long in service life, environmental-friendly, pollution-free and low in cost.

A conductive silicon oxide powder in which particles of silicon oxide having the formula: SiOx wherein 1 ‰¤ x < 1.6 are covered on their surfaces with a conductive carbon coating by chemical vapor deposition treatment is useful as a negative electrode active material to construct a lithium ion secondary cell having a high capacity and improved cycle performance.

The present invention is a negative electrode material for a secondary battery with a non-aqueous electrolyte comprising at least a silicon-silicon oxide composite and a carbon coating formed on a surface of the silicon-silicon oxide composite, wherein at least the silicon-silicon oxide composite is doped with lithium, and a ratio I(SiC)/I(Si) of a peak intensity I(SiC) attributable to SiC of 2θ=35.8±0.2° to a peak intensity I(Si) attributable to Si of 2θ=28.4±0.2° satisfies a relation of I(SiC)/I(Si)≦0.03, when x-ray diffraction using Cu—Kα ray. As a result, there is provided a negative electrode material for a secondary battery with a non-aqueous electrolyte that is superior in first efficiency and cycle durability to a conventional negative electrode material.

The invention discloses material with mixture of ions with sodium vanadium phosphate cathode material coated by carbon and a preparing method thereof, characterized in that the general formula of sodium vanadium phosphate cathode material is Na3V2-xMx(PO4-y)3Y3y/C, wherein 0<x<=0.2, 0><y<=0.05, M is Al, Fe, Cr, Ni, Co, Mg, Zn, La, Cu, Mn, Ti, Mo, Sn, Sr, Nb, Ce or Y, Y is For Cl. Through the carbon coating and the doping modification with ions for sodium vanadium phosphate cathode material, the electron conductivity of the material is improved and the electron-chemical property of material can be improved obviously.

The invention discloses a method for performing carbon coating modification on nano-powder by adopting a water-soluble polymer. The method comprises the following steps: weighing the water-soluble polymer (such as one or more of industrial modified starch, glucose and the like), surface active agent and the nano-powder according to the weight ratio of (0.1-10) : (0-5) : (80-100) as solid raw materials, preparing slurry with a dissolution and dispersion agent according to the solid-liquid ratio of (1-1000) g/50mL, uniformly stirring and dispersing, then performing suction filtration (or centrifugation) and drying to get a precursor, and then annealing at the temperature of 300 DEG C-700 DEG C under a protective atmosphere to get the nano-powder with good carbon-coating property. According to the method disclosed by the invention, the surface uniform carbon coating can be effectively performed on nano-material, electron and ion migration ratio in the material can be accelerated, the agglomeration of the nano-material can be inhibited, the void ratio and the like of the material can be improved, and the performance advantages of the nano-material can be further enhanced.

The invention discloses a positive electrode of a lithium sulfur battery and a preparation method of the positive electrode of the lithium sulfur battery. The positive electrode of the lithium sulfur battery comprises two parts, namely a carbon coating layer with low-active substance content on a current collector and an active layer with high-active substance content. The carbon coating layer on the surface of the current collector can improve the corrosion resistance of the current collector and prevent the current collector from being oxidized or corroded chemically. The positive electrode with the structure reduces the interface impedance of the current collector and the active layer, the electric conduction of the positive electrode of the battery is enhanced, and the volume volatilization of active substance materials is facilitated. The positive electrode with the structure is applied to the lithium sulfur battery, beneficial to the reduction of the internal resistance of the battery, prolongs to the cycle life of the battery and improves the multiplying power property of the battery.

There is provided a sliding member including a base body and a hard carbon coating formed on the base body to define a sliding surface for sliding contact with an opposing member under lubrication according to one embodiment of the present invention. The hard carbon coating has an outermost surface portion lower in hydrogen content than a remaining portion thereof, or an outermost coating layer lower in hydrogen content than at least one other coating layer.

The invention belongs to the field of electrode material synthesis, and relates to a sodium-titanium phosphate/carbon composite material and a preparation method and use thereof. The sodium-titanium phosphate/carbon composite material comprises secondary particles formed by clustering primary particles, the primary particles comprise sodium-titanium phosphate particles and carbon layers coated on the surfaces of the sodium-titanium phosphate particles, and the carbon layers are prepared through two times of carbon coating. According to the sodium-titanium phosphate/carbon composite material and the preparation method and use thereof, by means of preparing a precursor of the sodium-titanium phosphate and then adopting a spray drying method to carry out primary carbon coating and secondary carbon coating, the sodium-titanium phosphate/carbon composite material having a uniform and compact coating carbon layer is prepared, and the problem that the coating carbon layer obtained by the primary carbon coating is not uniform is solved. The composite material is good in stability, electrodes prepared from the sodium-titanium phosphate/carbon composite material and assembled batteries have excellent electrochemical properties, the discharge capacity is above 115mAh/g, and the capacity retention ratio is above 95% after 500 weeks of circulation.